Study On Preparation And Desulfurization Activity Of Loaded Heteropoly Acids

Combustion of sulfur-containing compounds in fuel can promote the formation of toxic sulfur oxides?SOx?,sulfur oxides is the main reason for the formation of acidic dust?such as fog,rain,snow etc.?,which result in acid rain,not only does harm to corrodes building,trees,and environment,but water and soil more acidic,grain output deduce and bringing huge losses to social economy.For the past years,as an increasing need for protecting the environment,the major countries of the world have passed laws to limit sulfur content in oil.China began to fully implement the five emission standards in January 1,2017.How to effectively remove the organic sulfur in fuel has become an issue of urgency.Oxidative desulfurization combined with extraction is one of the most promising processes for mild conditions and high removal efficiency of thiophene and other heterocyclic organic sulfur compounds,moreover,which need not consuming hydrogen.The keggin structure of heteropoly acid has been widely used because of its high catalytic activity,adjustable acidity and mild operating conditions.In view of the advantages of heteropoly acid,active components of solid heteropoly acid was loaded on the porous support.The research contents are as follows:Firstly,the active component[BMIM]₃HPW was loaded on the porous support by coprecipitation,mechanical mixing and sol-gel method,and the desulfurization performance of DBT was investigated.The experimental results show that,under the optimal condition,30wt%[BMIM]₃HPW/nano SiO₂ prepared by co precipitation as catalyst,the mass ratio of catalyst and oil is 0.22%,O/S=6,stirring reaction 120 min at 75?,washing after reaction,DBT removal rate reached more than 99%.The catalyst was reused.[BMIM]₃HPW/SiO₂ catalyst supported by co precipitation and sol-gel method is equipped with good regenerative activity,and the stability of[BMIM]₃HPW/nano SiO₂ was higher than[BMIM]₃HPW/SiO₂.Secondly,the active component[BMIM]3HPW was loaded on the activated carbon that is used water,hydrochloric acid,nitric acid and sodium hydroxide preprocessed by co precipitation and mechanical mixing.The desulfurization performance of DBT was investigated.The experimental results show that,under the optimal condition,HNO₃-C as a carrier,O:S=10:1 volume ratio is 1:5 of DMF and model oil,reaction 2 h at 60?,[Bmim]₃PW₁₂O₄₀/HNO3-C loading amount of 50wt%,DBT removal rate reached 86.95%.In conclusion,catalyst has high catalytic activity,broad prospects for industrial applications.Thirdly,[Bmim]₃PW₁₂O₄₀/SiO₂,[Bmim]₃PW₁₂O₄₀/C,[Bmim]₃PW₁₂O₄₀/SiO₂ and[Bmim]₃PW₁₂O₄₀/C catalysts were used to study the desulfurization performance of 200#solvent naphtha.The experimental results show that,under the optimal condition,O:S=14:1,the volume ratio of DMF and solvent naphtha is 1:2,reaction 2h at 70?,the mass ratio of catalyst and solvent naphtha is 0.263%.30wt%[Bmim]₃PW₁₂O₄₀/SiO₂ as catalyst without acetic acid,desulfurization rate reached 82.5%.30wt%[Bmim]₃PW₁₂O₄₀/nano SiO₂ with acetic acid as catalyst,solvent naphtha desulfurization rate reached 98.5%,and it can also satisfy the needs of industrial field.Above all,it is verified the validity of speculation for catalyst above mentioned should have high catalytic activity for light oil like 2004 solvent naphtha.Finally,in view of master of engineering one-year-intership,the following summarizes the main practice content,practice result and preliminary engineering ideas,which has made bedding for scientific research translated into productivity.